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[RFC PATCH v2 08/26] qcow2: Add offset_to_sc_index()
From: |
Alberto Garcia |
Subject: |
[RFC PATCH v2 08/26] qcow2: Add offset_to_sc_index() |
Date: |
Sun, 27 Oct 2019 00:25:10 +0300 |
For a given offset, return the subcluster number within its cluster
(i.e. with 32 subclusters per cluster it returns a number between 0
and 31).
Signed-off-by: Alberto Garcia <address@hidden>
---
block/qcow2.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block/qcow2.h b/block/qcow2.h
index 278ca41314..e25758079c 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -559,6 +559,11 @@ static inline int offset_to_l2_slice_index(BDRVQcow2State
*s, int64_t offset)
return (offset >> s->cluster_bits) & (s->l2_slice_size - 1);
}
+static inline int offset_to_sc_index(BDRVQcow2State *s, int64_t offset)
+{
+ return (offset >> s->subcluster_bits) & (s->subclusters_per_cluster - 1);
+}
+
static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
{
return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
--
2.20.1
- [RFC PATCH v2 00/26] Add subcluster allocation to qcow2, Alberto Garcia, 2019/10/26
- [RFC PATCH v2 16/26] qcow2: Add subcluster support to discard_in_l2_slice(), Alberto Garcia, 2019/10/26
- [RFC PATCH v2 01/26] qcow2: Add calculate_l2_meta(), Alberto Garcia, 2019/10/26
- [RFC PATCH v2 25/26] qcow2: Allow preallocation and backing files if extended_l2 is set, Alberto Garcia, 2019/10/26
- [RFC PATCH v2 13/26] qcow2: Add subcluster support to calculate_l2_meta(), Alberto Garcia, 2019/10/26
- [RFC PATCH v2 21/26] qcow2: Clear the L2 bitmap when allocating a compressed cluster, Alberto Garcia, 2019/10/26
- [RFC PATCH v2 08/26] qcow2: Add offset_to_sc_index(),
Alberto Garcia <=
- [RFC PATCH v2 06/26] qcow2: Add dummy has_subclusters() function, Alberto Garcia, 2019/10/26
- [RFC PATCH v2 10/26] qcow2: Update get/set_l2_entry() and add get/set_l2_bitmap(), Alberto Garcia, 2019/10/26
- [RFC PATCH v2 22/26] qcow2: Add subcluster support to handle_alloc_space(), Alberto Garcia, 2019/10/26
- [RFC PATCH v2 05/26] qcow2: Document the Extended L2 Entries feature, Alberto Garcia, 2019/10/26
- [RFC PATCH v2 14/26] qcow2: Add subcluster support to qcow2_get_cluster_offset(), Alberto Garcia, 2019/10/26
- [RFC PATCH v2 20/26] qcow2: Update L2 bitmap in qcow2_alloc_cluster_link_l2(), Alberto Garcia, 2019/10/26
- [RFC PATCH v2 19/26] qcow2: Fix offset calculation in handle_dependencies(), Alberto Garcia, 2019/10/26